:root{
  --navy:#0c1d28;
  --navy-2:#0f2735;
  --navy-3:#13303f;
  --teal:#1f9b94;
  --teal-2:#2fb3ad;
  --light:#f4f6f6;
  --text:#e8eef0;
  --muted:#9fb2ba;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:"Noto Sans JP",sans-serif;
  color:var(--text);
  background:var(--navy);
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
.container{width:min(1140px,90%);margin:0 auto}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;gap:.6em;
  padding:.85em 1.8em;border-radius:40px;font-weight:500;
  font-size:.95rem;transition:.25s;cursor:pointer;
}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-2);transform:translateY(-2px)}
.btn-outline{border:1px solid var(--teal);color:var(--teal)}
.btn-outline:hover{background:var(--teal);color:#fff}
.btn-lg{padding:1em 2.2em;font-size:1rem}
.arrow{font-size:1.1em;line-height:1}

/* ===== Sample banner ===== */
.sample-banner{
  position:fixed;top:0;left:0;width:100%;height:34px;z-index:200;
  display:flex;align-items:center;justify-content:center;gap:.6em;
  background:#07121a;border-bottom:1px solid rgba(47,179,173,.25);
  font-size:clamp(11px,2.4vw,13px);color:#9fb2ba;letter-spacing:.02em;
  white-space:nowrap;padding:0 .8rem;
}
.sample-banner a{color:var(--teal-2);font-weight:700;text-decoration:none}
.sample-banner a:hover{text-decoration:underline}
.sb-short{display:none}
@media(max-width:600px){
  .sb-long{display:none}
  .sb-short{display:inline}
}

/* ===== Header ===== */
.site-header{
  position:fixed;top:34px;left:0;width:100%;z-index:100;
  padding:1.1rem 0;transition:.3s;
  background:linear-gradient(180deg,rgba(12,29,40,.65),rgba(12,29,40,0));
}
.site-header.scrolled{background:rgba(10,24,33,.95);box-shadow:0 2px 20px rgba(0,0,0,.3);padding:.8rem 0}
.header-inner{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;flex-direction:column;line-height:1.1}
.logo-en{font-family:"Oswald",sans-serif;font-size:1.5rem;font-weight:700;letter-spacing:.08em;color:#fff}
.logo-jp{font-size:.62rem;letter-spacing:.18em;color:var(--muted)}
.nav{display:flex;align-items:center;gap:2rem}
.nav a{font-size:.9rem;font-weight:500;color:#fff;transition:.2s;position:relative}
.nav a:not(.nav-btn):hover,.nav a.active{color:var(--teal-2)}
.nav-btn{background:var(--teal);padding:.7em 1.4em;border-radius:40px}
.nav-btn:hover{background:var(--teal-2)}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer}
.hamburger span{width:26px;height:2px;background:#fff;transition:.3s}
.hamburger.active span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ===== Hero ===== */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;background:var(--navy)}
.hero-bg{
  position:absolute;inset:0;
  background:
    linear-gradient(100deg,rgba(8,17,25,.94) 0%,rgba(8,17,25,.78) 36%,rgba(8,17,25,.42) 66%,rgba(10,24,33,.55) 100%),
    url("images/hero.jpg") center 42%/cover no-repeat;
}
.hero-watermark{
  position:absolute;right:1%;top:50%;transform:translateY(-50%);
  writing-mode:vertical-rl;font-family:"Oswald",sans-serif;font-weight:700;
  font-size:clamp(2.5rem,6vw,5rem);letter-spacing:.15em;
  color:rgba(47,179,173,.22);user-select:none;white-space:nowrap;
}
.hero-content{position:relative;z-index:2}
.hero-title{
  font-size:clamp(2.6rem,6.5vw,4.8rem);font-weight:900;line-height:1.25;
  color:#fff;text-shadow:0 2px 20px rgba(0,0,0,.4);
}
.hero-lead{margin:1.8rem 0 2.4rem;font-size:clamp(.95rem,2vw,1.15rem);color:var(--text)}

/* ===== Section heads ===== */
.section-head{margin-bottom:3rem}
.section-en{font-family:"Oswald",sans-serif;font-size:clamp(1.8rem,4vw,2.4rem);font-weight:700;color:var(--teal-2);letter-spacing:.05em}
.section-en::after{content:"";display:block;width:46px;height:3px;background:var(--teal);margin-top:.6rem}
.section-jp{font-size:.8rem;letter-spacing:.2em;color:var(--muted);margin-top:.5rem}
.section-en.dark{color:var(--teal)}
.section-jp.dark{color:#5a6b73}

/* ===== Features ===== */
.features{background:var(--navy-2);padding:5.5rem 0}
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.08)}
.feature-item{background:var(--navy-2);padding:2rem 1.4rem;text-align:center}
.feature-icon{width:64px;height:64px;margin:0 auto 1.2rem}
.feature-icon svg{width:100%;height:100%}
.feature-item h3{font-size:1.1rem;font-weight:700;color:#fff;margin-bottom:.8rem}
.feature-item p{font-size:.85rem;color:var(--muted)}

/* ===== About ===== */
.about{background:var(--light);color:#2a3a42;padding:5.5rem 0}
.about-inner{display:grid;grid-template-columns:1fr 1.1fr;gap:3.5rem;align-items:center}
.about-text p{margin-bottom:1.4rem;color:#4a5a62;font-size:.95rem}
.about-text .section-jp{font-size:1.3rem;font-weight:700;color:#2a3a42;letter-spacing:.02em}
.about-img img{border-radius:6px;width:100%;height:360px;object-fit:cover;box-shadow:0 12px 30px rgba(0,0,0,.15)}

/* ===== Placeholders (差し替え用) ===== */
.ph{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.6rem;
  width:100%;border-radius:6px;color:var(--teal);
  background:linear-gradient(135deg,#11303f,#0d2230);
  border:1px dashed rgba(47,179,173,.4)}
.ph svg{width:46px;height:46px;opacity:.85}
.ph span{font-size:.78rem;letter-spacing:.12em;color:#8aa6ac}
.ph-lg{height:360px;box-shadow:0 12px 30px rgba(0,0,0,.15)}
.ph-lg svg{width:70px;height:70px}
.gallery-item .ph{height:180px}

/* ===== Gallery ===== */
.gallery{background:var(--light);color:#2a3a42;padding:0 0 5.5rem}
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem}
.gallery-item img{border-radius:6px;width:100%;height:180px;object-fit:cover;transition:.3s}
.gallery-item:hover img{transform:scale(1.04);box-shadow:0 10px 24px rgba(0,0,0,.18)}
.gallery-more{text-align:center;margin-top:2.5rem}

/* ===== CTA ===== */
.cta{position:relative;padding:5rem 0;text-align:center;overflow:hidden}
.cta-bg{position:absolute;inset:0;
  background:radial-gradient(100% 120% at 50% 0%,rgba(31,155,148,.16),rgba(8,17,25,0) 60%),
  linear-gradient(180deg,var(--navy-3),var(--navy));}
.cta-bg::after{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.02) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.02) 1px,transparent 1px);
  background-size:54px 54px;}
.cta-content{position:relative;z-index:2}
.cta h2{font-size:clamp(1.6rem,4vw,2.2rem);color:#fff;margin-bottom:1.2rem}
.cta p{color:var(--text);margin-bottom:1.5rem}
.cta-ig{display:inline-block;font-family:"Oswald",sans-serif;font-size:clamp(1.6rem,4.6vw,2.4rem);font-weight:700;color:#fff;letter-spacing:.04em;transition:.2s}
.cta-ig:hover{color:var(--teal-2)}
.cta-hours{font-size:.85rem;color:var(--muted);margin:.6rem 0 1.8rem}

/* ===== Footer ===== */
.site-footer{background:#081119;padding:2.5rem 0}
.footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1.5rem}
.footer-logo{display:flex;flex-direction:column;line-height:1.1}
.footer-nav{display:flex;gap:1.6rem;flex-wrap:wrap}
.footer-nav a{font-size:.85rem;color:var(--muted);transition:.2s}
.footer-nav a:hover{color:var(--teal-2)}
.copyright{font-size:.8rem;color:#5a6b73}

/* ===== Responsive ===== */
@media(max-width:900px){
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .gallery-grid{grid-template-columns:repeat(2,1fr)}
  .about-inner{grid-template-columns:1fr;gap:2rem}
}
@media(max-width:680px){
  .hamburger{display:flex}
  .nav{position:fixed;top:0;right:-100%;height:100vh;width:75%;max-width:300px;
    flex-direction:column;justify-content:center;gap:1.8rem;
    background:rgba(10,24,33,.98);transition:.35s;padding:2rem}
  .nav.open{right:0}
  .footer-inner{flex-direction:column;text-align:center}
  .footer-nav{justify-content:center}
}